Introduction
Use the tools & resources collected by Cloudflare Community MVPs in this tool tip to help you implement, use, and troubleshoot Cloudflare.
This is a Cloudflare Community Tip. Community Tips address best practices when configuring Cloudflare, how to fix issues you may see, and tools to use to help you troubleshoot. See all Community Tips.
Welcome to Cloudflare
At Cloudflare, we want to help you build something great. Visit the Welcome Center for a step-by-step walk you through the essential actions you need to take to get started.
After you visit the Welcome Center, return to this tip if you have any questions. We’re excited to see what you build.
Cloudflare Diagnostic Center
Checks: nameservers, DNSSEC, DS record configuration, if connecting to ‘domain.com’ works, if connecting to ‘www.domain.com’ works, & for existing MX records
Learn More
Performance Services
Reliability
Security Solutions
Serverless
CLI Multi-Tools
htrace.sh
Multi-Tools
Where’s It Up? API
Uptrends
internet.nl
keycdn
CentrolOps.net
TurboBytes
UltraTools
Google Application Security
BGP Stream
@BGPStream
bunny.net
Cloudflare Status
Cloudflare Status
Cloudflare Datacenter Reachability
Tool
Explanation
Cloudflare Apps
Store
Developers
Docs
Browsing Experience Security Check
Cloudflare Security Check
BGP
Is BGP safe yet?
Background
Browser & Browser Plugins
What’s My Browser
Claire, Is Site Using Cloudflare?
Dr.FLARE debug tool for Cloudflare (Chrome Extension)
cURL
Everything curl - the book
Using cURL when Troubleshooting with Cloudflare
dig
DigWebInterface
DNS Sleuthing with dig
DNS
$ dig ns example.com +short
Generate TLSA Record
DNS Troubleshooting
whatsmydns
DNS Checker
IntoDNS
MxToolbox SPF Record Generator
UltraTools DNS Lookup
DNSape
Historical DNS
Complete DNS
SecurityTrails
censys
VirusTotal
DNS Non-HTTPS Links
DNSViz
DNS-over-HTTPS (DoH)
Simple DNSCrypt
Cloudflared
DNS-over-TLS (DoT)
Stubby
unbound
Knot Resolver
DNSSEC
Verisign DNSSEC Analyzer
eMail
Learn & Test DMARC
MxToolbox
Microsoft Remote Connectivity Analyzer
DMARC Domain Checker
fraudmarc
DKIM Core Tools
proofpoint
Google Postmaster Tools
SPF Generator
Vamsoft
SparkPost
MultiRBL
Spammyness Test
MxToolbox Email Header Analyzer
Mail server test (TLS version, Mail delivery status, SSL certificate output & expiration):
Mail server test - each parameter as needed (click on “More Options” to show them):
Useful generator tools (BIMI, MTA-STS, TLS-RPT, SPF, DKIM, DMARC, FCrDNS check):
MTA-STS check:
Detecting HTTPS Interception
MITMEngine
MALCOLM
About
Peering
Hurricane Electric BGP Toolkit
PeeringDB Cloudflare
Privacy Pass
Get Privacy Pass
Cloudflare Supports Privacy Pass
Privacy Pass 2.0
SSL/TLS
crt.sh Certificate Search
SSL Labs Server Test
Dev Version SSL Labs Server Test
CDN77 TLS Test
Cloudflare SSL Test
BadSSL
TLSA and DANE check:
Performance
Cloudflare Load Balancing
Cloudflare Image Resizing
FastOrSlow
Minify
WebPagetest
Read How to use webpagetest.org for page load speed testing
Latency
Pingdom
GTmetrix
Cloudflare Webpage Speed Test Tool
Critical Path CSS Generator
Think With Google
Sucuri
Cloudflare Connection Speed Test
Trace
WinMTR
http://www.example.com/cdn-cgi/trace
$ traceroute example.com
$ dig example.com +trace
$ GET https://example.com/cdn-cgi/trace
Uptime
Hyperspin
Website
W3C Validator
Quttera
HOSTS.CX
Hardenize
Mozilla Observatory
Search Engine Spider Simulator
BROWSEO
Bot Simulator
Redirect Tracker
Safe Browsing site status
ShotSherpa - your website around the world
WebSitePulse
Experte Page Speed Test
Wordpress Tests
varvy
1.1.1.1 Tests
Read Me First
1.1.1.1 Diagnostic Tool
Developers
IP
IP WHOIS Lookup
IP Reputation Investigation
Project Honey Pot
Composite Blocking List
Cloudflare IPs
About Classless Inter-Domain Routing
Learning Center - Anycast Network
Help Center - How Cloudflare Works
Background & Research Resources
Cloudflare Help Center
Cloudflare Community search
Cloudflare Learning Center
Cloudflare Developers
Google
YouTube
Command Line Power User - Free video tutorials
Helpful On Support Tickets
HAR file(s)
Helpful Tests, Links and Commands
$ dig @1.1.1.1 ch txt whoami.cloudflare +short
$ dig +short @2606:4700:4700::1111 -6 ch txt whoami.cloudflare
$ curl -svo /dev/null https://example.com/
$ curl -svo /dev/null --resolve example.com:443:123.123.123.123 https://example.com/
$ curl -svo /dev/null --resolve example.com:80:123.123.123.123 http://example.com/
$ curl -svo /dev/null https://example.com --tlsv1.0
$ curl -svo /dev/null https://example.com --tlsv1.1
*Replace example.com with your domain & 123. with your origin IP address
Performance Option
Image Resizing is currently available for Pro, Business and Enterprise customers. To begin, ensure you have enabled Image Resizing in the Cloudflare dashboard. Cloudflare Load Balancing runs at each of our data centers across 250 cities worldwide and is powered by our DDoS-resilient DNS to ensure that traffic continues to get routed even under stress. Learn more about Cloudflare Load Balancing.
If You Need More Help
This community of other Cloudflare users may be able to assist you, login to Cloudflare and post your question to the Community. When you post on the Community make sure to include as much of this information as possible: the specific error message you are seeing, the URLs this is happening on, screen shot of the error, and the steps to reproduce the error. Please indicate what troubleshooting steps you’ve tried in order to help us help you.
Expert Comments Appreciated
This Community Tip will remain open for input from Community experts and those familiar with this issue. We really appreciate comments like: “What are the three things to always try” or “Do this first” or “In my experience”.
This is a Cloudflare Community Tip, review other tips here.
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